Stapling machine



FIG. 1 is a perspective view showing the top side, the left side and the front of the stapling machine according to the new design;

FIG. 2 is a perspective view showing the underside, the left side and the rear side of the stapling machine; and,

FIG. 3 shows the stapling machine from the right. 

The ornamental design for a stapling machine, as shown and described. 